Actually last version of realtemp is from early 2012, while coretemp last update is from 2013. Temp it reports on my rig are consistant with HWInfo.coretemp has been replaced by realtemp now. Coretemp was unreliable for reporting newer cpus accurately.
I prefer HWMonitor. Lays out everything in front of you and automatically tracks mins and maxes so you don't have to babysit.